3  * gpio-vbus.c - simple GPIO VBUS sensing driver for B peripheral devices
24  * A simple GPIO VBUS sensing driver for B peripheral only devices
26  * a regulator to limit the current drawn from VBUS.
39 	int			vbus;  member
45  * This driver relies on "both edges" triggering.  VBUS has 100 msec to
96 	int status, vbus;  in gpio_vbus_work()  local
101 	vbus = is_vbus_powered(gpio_vbus);  in gpio_vbus_work()
102 	if ((vbus ^ gpio_vbus->vbus) == 0)  in gpio_vbus_work()
104 	gpio_vbus->vbus = vbus;  in gpio_vbus_work()
112 	if (vbus) {  in gpio_vbus_work()
146 /* VBUS change IRQ handler */
153 	dev_dbg(&pdev->dev, "VBUS %s (gadget: %s)\n",  in gpio_vbus_irq()
196 	gpio_vbus->vbus = 0; /* start with disconnected */  in gpio_vbus_set_peripheral()
220 	/* draw max 0 mA from vbus in suspend mode; or the previously  in gpio_vbus_set_suspend()
251 	gpio_vbus->phy.label = "gpio-vbus";  in gpio_vbus_probe()
260 	/* Look up the VBUS sensing GPIO */  in gpio_vbus_probe()
261 	gpio_vbus->vbus_gpiod = devm_gpiod_get(dev, "vbus", GPIOD_IN);  in gpio_vbus_probe()
264 		dev_err(&pdev->dev, "can't request vbus gpio, err: %d\n", err);  in gpio_vbus_probe()
281 	 * The VBUS sensing GPIO should have a pulldown, which will normally be  in gpio_vbus_probe()
282 	 * part of a resistor ladder turning a 4.0V-5.25V level on VBUS into a  in gpio_vbus_probe()
365 MODULE_ALIAS("platform:gpio-vbus");
380 		.name  = "gpio-vbus",